Should I still take pregnancy test?

I didn't miss a period so I shouldn't be. I had it a week ago. It started 2 weeks after the last time I had sex. And I'm on birth control.

But because I've been really nauseated and tired and some pelvic pain. I've had people say I'm pregnant. Its probably all from something else. (Recently been treated for trich)

Help me prove them wrong. Please?